app.py

### PRE ###
import os
os.system('git clone https://github.com/ggerganov/whisper.cpp.git')
os.system('make -C ./whisper.cpp')
MODELS_TO_DOWNLOAD = ['tiny', 'medium'] # ['tiny', 'small', 'base', 'medium', 'large']

for model_name in MODELS_TO_DOWNLOAD:
    os.system(f'bash ./whisper.cpp/models/download-ggml-model.sh {model_name}')


### BODY ### 

import os
import requests
import json
import base64

import gradio as gr
from pathlib import Path
import pysrt
import pandas as pd
import re
import time

from pytube import YouTube
import torch

whisper_models = MODELS_TO_DOWNLOAD #["medium"]#["base", "small", "medium", "large", "base.en"]

custom_models = []
combined_models = []
combined_models.extend(whisper_models)
combined_models.extend(custom_models)

LANGUAGES = {
    "bg": "Bulgarian",
}

# language code lookup by name, with a few language aliases
source_languages = {
    **{language: code for code, language in LANGUAGES.items()}
}

source_language_list = [key[0] for key in source_languages.items()]

device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
print(f"DEVICE IS: {device}")

def get_youtube(video_url):
    yt = YouTube(video_url)
    abs_video_path = yt.streams.filter(progressive=True, file_extension='mp4').order_by('resolution').desc().first().download()
    print(f"Download complete - {abs_video_path}")
    return abs_video_path

def speech_to_text(video_file_path, selected_source_lang, whisper_model):
    """    
    Speech Recognition is based on models from OpenAI Whisper https://github.com/openai/whisper
    This space is using c++ implementation by https://github.com/ggerganov/whisper.cpp
    """
        
    if(video_file_path == None):
        raise ValueError("Error no video input")
        
    print(video_file_path)
    _,file_ending = os.path.splitext(f'{video_file_path}')
    input_wav_file = video_file_path.replace(file_ending, ".wav")
    srt_path = input_wav_file + ".srt"
    vtt_path = input_wav_file + ".vtt"
    try:
        print(f'file enging is {file_ending}, starting conversion to wav')
        subs_paths = video_file_path.replace(file_ending, ".wav")

        if os.path.exists(subs_paths):
            os.remove(subs_paths)
            
        os.system(f'ffmpeg -i "{video_file_path}" -ar 16000 -ac 1 -c:a pcm_s16le "{subs_paths}"')
        print("conversion to wav ready")
    
    except Exception as e:
        raise RuntimeError("Error Running inference with local model", e)
               
    try:
        print("starting whisper c++")
        os.system(f'rm -f {srt_path}')
        print('Running regular model')
        os.system(f'./whisper.cpp/main "{input_wav_file}" -t {os.cpu_count()} -l {source_languages.get(selected_source_lang)} -m ./whisper.cpp/models/ggml-{whisper_model}.bin -osrt -ovtt')
        print("whisper c++ finished")
    except Exception as e:
        raise RuntimeError("Error running Whisper cpp model")
    
    print(f'Subtitles path {srt_path}, {vtt_path}')
    return [vtt_path, srt_path]
    
def create_video_player(subs_files, video_in):
    print(f"create_video_player - {subs_files}, {video_in}")
                        
    with open(subs_files[0], "rb") as file:
        subtitle_base64 = base64.b64encode(file.read())
    
    with open(video_in, "rb") as file:
        video_base64 = base64.b64encode(file.read())

    video_player = f'''<video id="video" controls preload="metadata">
      <source src="data:video/mp4;base64,{str(video_base64)[2:-1]}" type="video/mp4" />
      <track
        label="English"
        kind="subtitles"
        srclang="en"
        src="data:text/vtt;base64,{str(subtitle_base64)[2:-1]}"
        default />
    </video>
    '''
    
    print('create_video_player - Done')
    return video_player


# ---- Gradio Layout -----
video_in = gr.Video(label="Video file", mirror_webcam=False)
youtube_url_in = gr.Textbox(label="Youtube url", lines=1, interactive=True)
video_out = gr.Video(label="Video Out", mirror_webcam=False)

selected_source_lang = gr.Dropdown(choices=source_language_list, 
                                   type="value", 
                                   value= source_language_list[0], #"Let the model analyze", 
                                   label="Spoken language in video", 
                                   interactive=True)
selected_whisper_model = gr.Dropdown(choices=whisper_models, 
                                     type="value", 
                                     value=whisper_models[0],#"base", 
                                     label="Selected Whisper model", 
                                     interactive=True)

subtitle_files = gr.File(
                label="Download subtitles",
                file_count="multiple",
                type="file",
                interactive=False,
            )

video_player = gr.HTML('<p>video will be played here after you press the button at step 4')
eventslider = gr.Slider(visible=False)
status_msg = gr.Markdown('Status')

demo = gr.Blocks()
demo.encrypt = False

def set_app_msg(app_state, msg):
    app_state['status_msg'] = msg

def transcribe(app_state, youtube_url_in, selected_source_lang, selected_whisper_model):
    set_app_msg(app_state, 'Downloading the movie ...')
    video_file_path = get_youtube(youtube_url_in)
    set_app_msg(app_state, f'Running the speech to text model {selected_source_lang}/{selected_whisper_model}. This can take some time.')
    subtitle_files = speech_to_text(video_file_path, selected_source_lang, selected_whisper_model)
    set_app_msg(app_state, f'Creating the video player ...')
    video_player = create_video_player(subtitle_files, video_file_path)
    set_app_msg(app_state, f'Done...')
    return subtitle_files, video_player
    

def on_change_event(app_state):
    print('Running!')
    return app_state['status_msg']

with demo:
    app_state = gr.State({
                          'running':False,
                          'status_msg': ''
                         })
    
    with gr.Row():
        with gr.Column():
            gr.Markdown('''### 1. Copy any non-private Youtube video URL to box below or click one of the examples.''')
            examples = gr.Examples(examples=["https://www.youtube.com/watch?v=UjAn3Pza3qo", "https://www.youtube.com/watch?v=oOZivhYfPD4"], 
               label="Examples", inputs=[youtube_url_in])
            # Inspiration from https://huggingface.co/spaces/vumichien/whisper-speaker-diarization
            
    with gr.Row():
        with gr.Column():
            youtube_url_in.render()
            selected_source_lang.render()
            selected_whisper_model.render()
            
            download_youtube_btn = gr.Button("Transcribe the video")
            download_youtube_btn.click(transcribe, [app_state, youtube_url_in, selected_source_lang, selected_whisper_model], [subtitle_files, video_player])
            
            eventslider.render()
            status_msg.render()
            subtitle_files.render()
            video_player.render()
    with gr.Row():
        gr.Markdown('This app is based on [this code](https://huggingface.co/spaces/RASMUS/Whisper-youtube-crosslingual-subtitles/tree/main) by RASMUS.')

    dep = demo.load(on_change_event, inputs=[app_state], outputs=[status_msg], every=10)



#### RUN ###
is_kaggle = os.environ.get('KAGGLE_KERNEL_RUN_TYPE')
print(is_kaggle)

if is_kaggle:
    demo.queue().launch(share=True, debug=True)
else:
    demo.queue().launch()